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Compensation - Compensation Expense Related to Issuance of Common Stock and Grants of Exchangeability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]
Issuance of common stock and exchangeability expenses	$ 45,970	$ 30,059	$ 135,202	$ 78,017

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- Definition

Common Stock, Exchangeability Granted, Issued, Expense

+ References

No definition available.

+ Details

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Namespace Prefix:	nmrk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration